EP 0708122 A2 19960424 - Process for the production of high solids latex
Title (en)
Process for the production of high solids latex
Title (de)
Verfahren zur Herstellung von festkörperreichem Latex
Title (fr)
Procédé de production de latex à haute teneur en matière solide
Publication
Application
Priority
US 32419794 A 19941017
Abstract (en)
[origin: US5476897A] This invention discloses a process for preparing a latex having a high solids content which comprises the steps of (1) terpolymerizing a vinyl aromatic monomer, an alkyl propenoic acid ester, and an alkyl propenoic acid monomer in an aqueous polymerization medium by free radical polymerization in a first polymerization step to produce a seed polymer latex; (2) neutralizing the seed polymer latex to a pH of about 7 to about 10 by the addition of an alkali to produce a neutralized seed polymer latex; (3) adding additional vinyl aromatic monomer and alkyl propenoic acid ester to the neutralized seed polymer latex and allowing the additional vinyl aromatic monomer and the additional alkyl propenoic acid ester to polymerize in a second polymerization step to a solids content of at least about 40% to produce the latex having the high solids content; wherein about 20 percent to about 40 percent of the total amount of monomers polymerized in the first polymerization step and the second polymerization step are polymerized in the first polymerization step; and wherein the additional vinyl aromatic monomer and the additional alkyl propenoic acid ester are added in the second polymerization step at rate whereby a monomer conversion of at least 85 percent is maintained at all times.
IPC 1-7
IPC 8 full level
C08F 2/22 (2006.01); C08F 2/44 (2006.01); C08F 285/00 (2006.01)
CPC (source: EP KR US)
C08F 2/22 (2013.01 - KR); C08F 2/44 (2013.01 - KR); C08F 285/00 (2013.01 - EP KR US)
Designated contracting state (EPC)
DE ES FR GB IT NL
DOCDB simple family (publication)
US 5476897 A 19951219; AU 3432195 A 19960502; AU 690330 B2 19980423; BR 9504354 A 19970408; CA 2139523 A1 19960418; EP 0708122 A2 19960424; EP 0708122 A3 19970716; JP H08198904 A 19960806; KR 960014159 A 19960522
DOCDB simple family (application)
US 32419794 A 19941017; AU 3432195 A 19951017; BR 9504354 A 19951010; CA 2139523 A 19950104; EP 95115633 A 19951004; JP 26864095 A 19951017; KR 19950035589 A 19951016